Rio woke him up

Rio is known to be a relaxed but friendly city.

At first, when her brother and father argued with each other during elementary and middle school, she remained indifferent towards the duo by blocking out their banter with music. Despite doing so, she detested their arguments and wished for the two to get along.

However, the moment her brother, Ryo, started chasing Ichika, and their relationship grew stronger because of this, she thought that having her best friend dating her older brother would be fun, though she immediately dismissed the first statement and felt that it would make her happy.

It has been made clear that she supports Ryo and Ichika's relationship. But she also has a protective side when it comes to Ichika, as she told Ryo that she won't support him in his love life, even if he is her brother, especially knowing that Ichika is involved.